Experimental study on concurrent factors influencing the ITZ effect on mass transport in concrete
Experimental study on concurrent factors influencing the ITZ effect on mass transport in concrete
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DOI：
10.1016/j.cemconcomp.2021.104215
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发表时间：
2021-08-14
影响因子：
10.5
通讯作者：
De Schutter, Geert
中科院分区：
文献类型：
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作者：
Wu, Kai;Han, Hao;De Schutter, Geert
这是一个挑战，隔离的ITZ效应的质量传输从几个并发因素。本研究设计了一个系统的实验工作，以评估的相对重要性ITZ的气体渗透性，毛细水吸收和氯离子迁移，考虑预处理制度，骨料体积含量和尺寸的影响。给出了界面区与水泥基体之间的质量传递比与界面区厚度的关系。在分析界面效应时，除考虑稀释度和弯曲度外，还应考虑水泥基体密实化、粗集料沿着泌水等因素。骨料含量越高或骨料粒径越细，密实化效应和界面效应越显著。界面区的变化对氯离子迁移更为敏感，而吸附性较小。由于预处理产生的裂纹可能会误导ITZ效应的分析，ITZ效应也取决于输运类型。这项研究有望提供更多的洞察某些组分对混凝土性能的影响。
It is a challenge to isolate the ITZ effect on the mass transport from several concurrent factors. This study designed a systematical experimental work to assess the relatively importance of ITZ to gas permeability, capillary water absorption and chloride migration, considering the effect of preconditioning regime, aggregate volume content and size. The ratio of mass transport between ITZ and bulk cement matrix was given against ITZ thickness. Besides the dilution and tortuosity, factors such as densification of bulk cement matrix, bleeding along coarse aggregate should also be considered in the analysis of ITZ effect. The densification effect and ITZ effect would be more prominent with a higher aggregate content or finer aggregate size. The sorptivity is less while chloride migration is more sensitive to the variation of ITZ. The cracks due to precondition could mislead the analyzing ITZ effect, which is also dependent on the type of transport. This study is expected to offer more insight into the effect of certain components on the performance of concrete.